12912071 has 4 divisors (see below), whose sum is σ = 12927672. Its totient is φ = 12896472.

The previous prime is 12912043. The next prime is 12912073. The reversal of 12912071 is 17021921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12912071 - 2¹⁰ = 12911047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12912073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6485 + ... + 8238.

It is an arithmetic number, because the mean of its divisors is an integer number (3231918).

Almost surely, 2^12912071 is an apocalyptic number.

12912071 is a deficient number, since it is larger than the sum of its proper divisors (15601).

12912071 is an equidigital number, since it uses as much as digits as its factorization.

12912071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15600.

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 12912071 is about 3593.3370284458. The cubic root of 12912071 is about 234.6021395289.

Adding to 12912071 its reverse (17021921), we get a palindrome (29933992).

The spelling of 12912071 in words is "twelve million, nine hundred twelve thousand, seventy-one".